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Catechol production by different Streptomyces strains. S. griseus Tü 19 (•, ▵), S. griseus Tü 6 (▾), Streptomyces sp. strain ATCC 700974 (▪, ⋄), S. griseus Tü 17 (♦), S. coelicolor M145 (○), S. lividans TK23 (▿), and S. albus G J1074 (□) were grown at 30°C in M9 minimal medium with (⋄, ▵) or without (•, ▾, ▪, ♦, ○, ▿, □) the addition of 50 μM Fe3+. The concentration of catechol in the supernatant was determined using the Arnow assay.
